Heat a 12 inch skillet over medium heat. Chop bacon and fry until crisp. Remove bacon from pan and reserve the grease. Add onion and sautee for about 5 minutes. Add cream cheese and chicken broth. Heat and stir this mixture until smooth. Add green beans to pan and mix well. Pour green bean mixture into casserole dish. Top with parmesan cheese and bacon. You can also add a few tablespoons of fried onions as a garnish if you like.